| Alton to Santarem | 903.65 mi (1,454.28 km) |
| Alton to Santiago do Cacem | 982.47 mi (1,581.13 km) |
| Alton to Santo Andre | 981.25 mi (1,579.16 km) |
| Alton to Santo Tirso | 765.96 mi (1,232.69 km) |
| Alton to Sao Bras de Alportel | 1,024.98 mi (1,649.54 km) |
| Alton to Sao Felix da Marinha | 788.13 mi (1,268.38 km) |
| Alton to Sao Joao da Madeira | 793.81 mi (1,277.51 km) |
| Alton to Sao Joao de Ver | 791.58 mi (1,273.92 km) |
| Alton to Sao Mamede de Infesta | 777.24 mi (1,250.85 km) |
| Alton to Sao Pedro do Sul | 794.30 mi (1,278.30 km) |
| Alton to Satao | 788.72 mi (1,269.32 km) |
| Alton to Seia | 808.13 mi (1,300.55 km) |
| Alton to Senhora da Hora | 779.25 mi (1,254.08 km) |
| Alton to Serpa | 967.92 mi (1,557.71 km) |
| Alton to Serta | 855.80 mi (1,377.27 km) |
